Spring-mattress



R. COOPERSMITH.

SPRING MATTRESS.

APPLICATION FILED DEC. I9. I9I9.

1,382,344, Patented June 21, 1921.

/6 7. /6 fin UNITED STATES Renown GOOIPERSMITH, or MONTREAL,

TO ABRAHAM RUCHE, 0F PHILADELPHIA,

PATENT OFFICE,

QUEBEC, CAN-Allah, ASSIGNOR ONE-HALF PENNSYLVANIA.

SPRING-MATTRESS. c

Application filed December bed bottoms and the object of the invention is to provide a bed bottom of what is commonly known as the coil spring or spiral spring type which will be absolutely noiseless and in which the sagging will be reduced to a minimum.

According to this invention the bed bottom or spring comprises a rigid bottom frame and a floating top frame with a series of spiral, helical springs mounted between.

he springs are connected by means of helical springs which extend from side to side of the floating frame. The spiral, helical or upright springs are specially formed in their uppermost turns to hold them against creeping on the transverse helical springs and to hold themselves against enlargement in use. The rigid bottom frame is a grid of thin metal bars disposed on edge and notched into one another.

In the drawings which illustrate the invention;-

Figure 1 is a fragmentary, plan view of the device.

Fig. 2 is a side elevation of one of the right springs.

Fig. 3 is a fragmentary, perspective view illustrating a section'of the bottom grid.

Referring more particularly to the drawings, 11 designates the side member of the rigid bottom frame which may be of any suitable construction and which carries transversely disposed bars 12 supporting longitudinally disposed bars 13. The transverse bars may, if desired, be twisted or bent in any suitable manner at their extremities for attachment to the frame 11. These bars are of thin'metal and are disposed on edge so as to have a maximum by a vertically acting load. Preferably the transversely disposed bars 12 are deeper than the longitudinally disposed bars 13 andmay also be thicker. The adjacent edges of the bars are notched as at 14 so that they may be Specification of Letters Patent.

resistance to flexion Patented June 21, 1921. 19, 1919. Serial No. 346,032. 4

let into one another and thereby support one another agamst swinging erably the lower transverse bars may be unimpaired. It ma also be found advisable to make the notches in the transverse bars shallower than in the longitudinal bars in order to preserve as much as possible the strength in-the transverse bars. 12 and 13 are p of upright springs 16 hese upright springs 16 are of. the usual spiral, helical or conical type and are arranged large end uppermost in the usual manner. The uppermost convolution of each sp-r1ng16 is provided with diametrily opposite, outwardly extending, open loops 17 of such length that when the springs are in position the loops of one row of springs will be spaced a short distance from the loops of the springs in the next row. At he commencement of the uppermost convolution of each spring the wire thereof is downwardly ofiset, as shown at 18, and the extremity of the wire forming the last convolution of the spring is looped around the Wire at or immediately above this offset, as shown at 19. It will further be noticed that the ofiset and loop 19 are formed approximately midway between the loops 17, so that any. tendency to enlarge the spring, due to tension applied tothe loops 17, will cause the loop 19 to slide on the wire in a downward direction. As the loop. 19 is formed above the offset 18 this is impossible and the spring is, therefore, held against enlargement.

lhe springs 16 are'arranged in rows longitudinally and transversely of the frame 11 as clearly'shown in Fig. 1, being threaded at the lower ends through the bars 12 and 13 and disposed with their loops 17 extending longitudinally of the structure. Preferably those springs at the tudinal rows have only one loop 17 projecting away from the end of the structure. The springs at the ends of the longitudinal and. transverse rows are connected to the usual floating frame 20 by any suitable means such as the clips 21; I

ends of the longi versely of bers of the frame swinging either transversely or longitudiof the structure. In a properly constructed device the springs 22 will exert a slight tension in the uppermost convolutions of the springs 16 in the longitudinal direction of the device so that there will be no looseness or rattling. The extremities of the loops 17 are also preferably of such size that the wire of the sprin s 22 will fit tightly in the loops 1'? and the loopswill fit tightly between the turns of the springs 22. The springs 22, in addition to holding the springs 16 against swinging, also hold them against revolution which would disnally connect them from the bars 12 and 13.

. siderable creaking results.

the springs 22- are It has been discovered that one of the reasons why the ordinary coil spring mattress creaks and cracks is because of the very short connecting members between the springs, with the result that a small amount of spring compression reduces a very considerable angular or be ily movement of the connecting pieces, with the result that con- In some constructions of this type the springs are connected by intersecting members arranged diagonally with respect tothe frame, with the result that the compression of any one spring produces relative sliding movement betweenthe connectors which ives rise to a creaking or-cracking sound. lln. the pres-- ent structure there is no sliding movement and practically no angular movement at points of intersection, with the result that no creaking or cracking can be possible. The transverse connecting members, that is, easily elongated so that localized pressure on the device produces only local compression of the springs 16 and does not result in sloping the whole surface of the structure to the locality of.-

pressure;

Having thus described my invention, what I claim is 1. In a device of the class described, a

rigid bottom frame comprising a gr1d formed of longitudinal and transverse members arranged on edge and let into one another, helical sprin maintained in upright position on saiframe, the members of the frame being apertured adjacent their intersection for the reception of the lower ends of the upright springs, a top frame and helical springs stretched between opposite sides of. said ,frame and connecting the uppermost convolutions of adjacent upright springs, said helical springs being arranged to hold the upright springs against revolution'in the rigid body frame.

2. A device according to claim 1 in which the longitudinally disposed members are notched on their lower edges and the transversely disposed members are notched on their upper edges, the longitudinally disposed members being of less depth than the transversely disposed members.

3. A device according 'to claim 1, in which the upright springs are provided with diametrically opposite loops with which the helical springs engage, a single helix of the spring engaging and connecting the loops of adjoining upright springs.

4. In a device of the character described, a bottom frame, helical springs maintained in upright position on said frame and provided with diametric opposite loops, a top In witness whereof I have hereunto setmy hand.

RUDOLPH OOOPERSMITH.

horizontal. 

